The vaccine can prevent kids from contracting it, but in most cases it doesn't - they get it, but usually a milder case than they would have without the vaccine.

Quote:

Originally Posted by hailey1312

it's not a vaccine that gives lifelong immunity. So it could even wear off.

Quote:

Originally Posted by Computermama

Very few vaccines grant lifelong immunity. Most are supposed to be followed up with boosters every 5-10 years. The varicella vaccine is one of them, which is why we've chosen to put it off until titers can be drawn at puberty.